Who is guilty of a breach of contract?

A.
Although, the medical team provided all care, they were unable to save the patient who was brought in after an accident.
B.
A physician tells her patient that the clinic is not equipped to carry out a certain procedure.
C.
Danielle, a nurse does physiotherapy for the patients when the regular physiotherapist is out.
D.
Although Leo knows about the clinic charges, he still requests the clinic for a discount on his bill.